Vibrio parahaemolyticus is a type of bacteria commonly found in warm seawater and is often associated with seafood, particularly raw or undercooked shellfish. It can cause gastrointestinal illness in humans, leading to symptoms such as diarrhea, abdominal cramps, nausea, and vomiting. This bacterium thrives in coastal regions and is more prevalent during the summer months. Infection typically occurs after consuming contaminated food or water. Proper cooking and handling of seafood can help prevent illness caused by Vibrio parahaemolyticus.